The AR-15 is the pioneer system of the AR platform of weapons. Developed in the 1950s by Eugene Stoner, it has proven itself a time tested machine, worthy of a top spot in the modern military age. The standard rifle is outfitted with M16 furniture, but the weapon can be upgraded and parts can be swapped out for any number of popular AR variants.
The AR-15 is a steady rifle, featuring decent stats across the board. What it doesn't do in damage, it makes up for with it's insane reliability.
With a mod pool that would make Kalashnikov blush, the AR-15 has nearly a hundred unique modifications, which can be expanded upon with custom attachments, as well as other AR Pack modules.